'simplify' expression not efficient in Matlab2015

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Kiran Sagar
Kiran Sagar 2016-2-21
评论： Star Strider 2016-2-21
I used Matlab 2015 to simplify an trigonometric expression, but in vain. It is not able to replace 1-sin^2() with cos^2(). If my memory serves correctly, Matlab2014 was able to do this very efficiently.
Is there a new function that does this in 2015, or we just lost a great feature.
Edit: Inserted Picture

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回答（1 个）

Walter Roberson
Walter Roberson 2016-2-21
syms theta
simplify( 1 - sin(theta)^2 )
  2 个评论
Star Strider
Star Strider 2016-2-21
In R2015b:
syms theta
q1 = simplify(1 - sin(theta)^2, 'steps', 10)
q2 = rewrite(1 - sin(theta)^2, 'cos')
q1 =
cos(theta)^2
q2 =
cos(theta)^2

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